The paper critically examines the dominant neoclassical views on the adoption of mandatory Fully Funded (FF) pension schemes as a partial or complete substitute for the unfunded Pay-as-you-go (PAYG) type. According to this view, such a transition will have the positive real effect of endowing future generations with higher capital and output per head, since it should cause a once and for all increase in aggregate saving and the capital stock. This would prepare the economy for future demographic developments. We examine three obstacles to such a claim. To begin with, the reform may fail to boost workers’ marginal propensity to save, since workers may contract their voluntary saving to compensate for the larger mandatory saving to F...